kafka.server.MessageSetSend.scala Maven / Gradle / Ivy
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/**
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package kafka.server
import java.nio._
import java.nio.channels._
import kafka.network._
import kafka.message._
import kafka.utils._
import kafka.common.ErrorMapping
/**
* A zero-copy message response that writes the bytes needed directly from the file
* wholly in kernel space
*/
@nonthreadsafe
private[server] class MessageSetSend(val messages: MessageSet, val errorCode: Short) extends Send {
private var sent: Int = 0
private val size: Int = messages.sizeInBytes
private val header = ByteBuffer.allocate(6)
header.putInt(size + 2)
header.putShort(errorCode)
header.rewind()
var complete: Boolean = false
def this(messages: MessageSet) = this(messages, ErrorMapping.NoError)
def this() = this(MessageSet.Empty)
def writeTo(channel: GatheringByteChannel): Int = {
expectIncomplete()
var written = 0
if(header.hasRemaining)
written += channel.write(header)
if(!header.hasRemaining) {
val fileBytesSent = messages.writeTo(channel, sent, size - sent)
written += fileBytesSent
sent += fileBytesSent
}
if(logger.isTraceEnabled)
if (channel.isInstanceOf[SocketChannel]) {
val socketChannel = channel.asInstanceOf[SocketChannel]
logger.trace(sent + " bytes written to " + socketChannel.socket.getRemoteSocketAddress() + " expecting to send " + size + " bytes")
}
if(sent >= size)
complete = true
written
}
def sendSize: Int = size + header.capacity
}